Revellers from London dance as they wait for fireworks to start at the London Eye on the River Thames during New Year celebrations in London December 31, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY)

Revellers from London dance as they wait for fireworks to start at the London Eye on the River Thames during New Year celebrations in London December 31, 2014. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY)